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SQL Server 2008
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SQL Server 2008 Administration
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Data distribution
Data distribution
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sunny.tjk
sunny.tjk
Posted Tuesday, January 08, 2013 4:52 PM
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How can I find data distribution for a column?
Post #1404497
Evil Kraig F
Evil Kraig F
Posted Tuesday, January 08, 2013 5:19 PM
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What exactly are you looking for, the heuristics?
I mean, straight data distribution could be done with a SELECT column, COUNT(*) AS cnt FROM table GROUP BY column.
Can you be a little more specific as to what exactly you're trying to determine?
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Post #1404502
Grant Fritchey
Grant Fritchey
Posted Wednesday, January 09, 2013 4:41 AM
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If the column has statistics on it, those represent the data distribution as SQL Server understands it. You can use DBCC SHOW_STATISTICS to see the density, also known as selectivity, and the histogram, which is the data distribution. If statistics don't exist for the column, you can just create them manually using
CREATE STATISTICS
. Then take a look at the distribution using SHOW_STATISTICS.
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Post #1404677
sunny.tjk
sunny.tjk
Posted Wednesday, January 09, 2013 7:50 AM
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Grant Fritchey (1/9/2013)
If the column has statistics on it, those represent the data distribution as SQL Server understands it. You can use DBCC SHOW_STATISTICS to see the density, also known as selectivity, and the histogram, which is the data distribution. If statistics don't exist for the column, you can just create them manually using
CREATE STATISTICS
. Then take a look at the distribution using SHOW_STATISTICS.
This is what I needed. Thanks a lot Grant.
Post #1404796
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